* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.main-content {
    display: flex;
    gap: 50px;
    padding-top: 20px;
    padding-bottom: 20px;
    background-color: #222;
    color: white;
}

.sidebar {
    width: 18%;
}

/* Khung quảng cáo */
.ad-box {
    background: #222;
    /* border: 1px solid #ddd; */
    min-height: 250px;
    margin-bottom: 20px;
    padding: 15px;
    text-align: center;
    color: #222;
}

.game {
    text-align: center;
    width: 100%;
}

canvas {
    display: block;
    margin: auto;
    border: 5px solid #00ff66;
    background: #111;
    touch-action: none;
}

#playBtn {
    background-color: #00ff66;
    margin-left: 5%;
    margin-top: 20px;
    padding: 12px 30px;
    font-size: 20px;
    cursor: pointer;
}

.score {

    /* margin: 15px; */
    font-size: 22px;

}

#score {
    margin-left: 15px;
}


article {

    max-width: 900px;

    margin: 50px auto;

    padding: 20px;

    background: white;

    color: #333;

    line-height: 1.8;

}

.articles {
    /* width: 60%; */
    margin: 60px auto;
    padding-left: 18%;
    padding-right: 18%;
}

.articles p {
    font-size: 20px;
}

.articles h2 {
    color: red;
}

.do-kho {
    padding-left: 50px;
    /* padding-right: auto; */
    display: flex;
    padding-bottom: 5px;
}

.do-kho-nho {
    padding-left: 2%;
}

.do-kho-nho a {
    text-decoration: none;
    color: white;
}

.do-kho-nho a.active {
    color: white;
    background: #3b61b5;
    padding: 3px 12px;
    border-radius: 6px;
}


#soundBtn {
    width: 32px;
    height: 30px;
    border: none;
    border-radius: 12px;
    background: #2196f3;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
}

#soundBtn:active {
    transform: scale(.95);
}